author  nipkow 
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child 16417  9bc16273c2d4 
permissions  rwrr 
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(* Title: HOL/UNITY/AllocImpl 
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ID: $Id$ 
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory 
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Copyright 1998 University of Cambridge 
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*) 
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header{*Implementation of a multipleclient allocator from a singleclient allocator*} 
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theory AllocImpl = AllocBase + Follows + PPROD: 
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(** State definitions. OUTPUT variables are locals **) 
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(*Type variable 'b is the type of items being merged*) 
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record 'b merge = 
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In :: "nat => 'b list" (*merge's INPUT histories: streams to merge*) 
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Out :: "'b list" (*merge's OUTPUT history: merged items*) 

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iOut :: "nat list" (*merge's OUTPUT history: origins of merged items*) 
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record ('a,'b) merge_d = 
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"'b merge" + 
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dummy :: 'a (*dummy field for new variables*) 
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constdefs 
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non_dummy :: "('a,'b) merge_d => 'b merge" 
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"non_dummy s == (In = In s, Out = Out s, iOut = iOut s)" 
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record 'b distr = 
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In :: "'b list" (*items to distribute*) 
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iIn :: "nat list" (*destinations of items to distribute*) 
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Out :: "nat => 'b list" (*distributed items*) 
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record ('a,'b) distr_d = 
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"'b distr" + 
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dummy :: 'a (*dummy field for new variables*) 
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record allocState = 
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giv :: "nat list" (*OUTPUT history: source of tokens*) 
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ask :: "nat list" (*INPUT: tokens requested from allocator*) 
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rel :: "nat list" (*INPUT: tokens released to allocator*) 
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record 'a allocState_d = 
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allocState + 
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dummy :: 'a (*dummy field for new variables*) 
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record 'a systemState = 
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allocState + 
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mergeRel :: "nat merge" 
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mergeAsk :: "nat merge" 
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distr :: "nat distr" 
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dummy :: 'a (*dummy field for new variables*) 
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constdefs 
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(** Merge specification (the number of inputs is Nclients) ***) 
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(*spec (10)*) 
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merge_increasing :: "('a,'b) merge_d program set" 
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"merge_increasing == 
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UNIV guarantees (Increasing merge.Out) Int (Increasing merge.iOut)" 
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(*spec (11)*) 
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merge_eqOut :: "('a,'b) merge_d program set" 
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"merge_eqOut == 
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UNIV guarantees 
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Always {s. length (merge.Out s) = length (merge.iOut s)}" 
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(*spec (12)*) 
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merge_bounded :: "('a,'b) merge_d program set" 
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"merge_bounded == 
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UNIV guarantees 
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Always {s. \<forall>elt \<in> set (merge.iOut s). elt < Nclients}" 
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(*spec (13)*) 
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merge_follows :: "('a,'b) merge_d program set" 
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"merge_follows == 
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(\<Inter>i \<in> lessThan Nclients. Increasing (sub i o merge.In)) 
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guarantees 
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(\<Inter>i \<in> lessThan Nclients. 
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(%s. sublist (merge.Out s) 

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{k. k < size(merge.iOut s) & merge.iOut s! k = i}) 
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Fols (sub i o merge.In))" 
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(*spec: preserves part*) 
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merge_preserves :: "('a,'b) merge_d program set" 
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"merge_preserves == preserves merge.In Int preserves merge_d.dummy" 
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(*environmental constraints*) 
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merge_allowed_acts :: "('a,'b) merge_d program set" 
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"merge_allowed_acts == 
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{F. AllowedActs F = 
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insert Id (UNION (preserves (funPair merge.Out merge.iOut)) Acts)}" 
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merge_spec :: "('a,'b) merge_d program set" 
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"merge_spec == merge_increasing Int merge_eqOut Int merge_bounded Int 
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merge_follows Int merge_allowed_acts Int merge_preserves" 
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(** Distributor specification (the number of outputs is Nclients) ***) 
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(*spec (14)*) 
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distr_follows :: "('a,'b) distr_d program set" 
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"distr_follows == 
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Increasing distr.In Int Increasing distr.iIn Int 
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Always {s. \<forall>elt \<in> set (distr.iIn s). elt < Nclients} 
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guarantees 
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(\<Inter>i \<in> lessThan Nclients. 
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(sub i o distr.Out) Fols 
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(%s. sublist (distr.In s) 
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{k. k < size(distr.iIn s) & distr.iIn s ! k = i}))" 
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distr_allowed_acts :: "('a,'b) distr_d program set" 
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"distr_allowed_acts == 
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{D. AllowedActs D = insert Id (UNION (preserves distr.Out) Acts)}" 
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distr_spec :: "('a,'b) distr_d program set" 
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"distr_spec == distr_follows Int distr_allowed_acts" 
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(** Singleclient allocator specification (required) ***) 
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(*spec (18)*) 
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alloc_increasing :: "'a allocState_d program set" 
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"alloc_increasing == UNIV guarantees Increasing giv" 
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(*spec (19)*) 
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alloc_safety :: "'a allocState_d program set" 
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"alloc_safety == 
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Increasing rel 
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guarantees Always {s. tokens (giv s) \<le> NbT + tokens (rel s)}" 
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(*spec (20)*) 
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alloc_progress :: "'a allocState_d program set" 
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"alloc_progress == 
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Increasing ask Int Increasing rel Int 
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Always {s. \<forall>elt \<in> set (ask s). elt \<le> NbT} 
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Int 
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(\<Inter>h. {s. h \<le> giv s & h pfixGe (ask s)} 
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138 
LeadsTo 
14114  139 
{s. tokens h \<le> tokens (rel s)}) 
140 
guarantees (\<Inter>h. {s. h \<le> ask s} LeadsTo {s. h pfixLe giv s})" 

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141 

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142 
(*spec: preserves part*) 
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alloc_preserves :: "'a allocState_d program set" 
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144 
"alloc_preserves == preserves rel Int 
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145 
preserves ask Int 
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146 
preserves allocState_d.dummy" 
14114  147 

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148 

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149 
(*environmental constraints*) 
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alloc_allowed_acts :: "'a allocState_d program set" 
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151 
"alloc_allowed_acts == 
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{F. AllowedActs F = insert Id (UNION (preserves giv) Acts)}" 
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153 

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alloc_spec :: "'a allocState_d program set" 
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"alloc_spec == alloc_increasing Int alloc_safety Int alloc_progress Int 
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156 
alloc_allowed_acts Int alloc_preserves" 
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157 

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158 
locale Merge = 
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159 
fixes M :: "('a,'b::order) merge_d program" 
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160 
assumes 
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Merge_spec: "M \<in> merge_spec" 
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162 

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163 
locale Distrib = 
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fixes D :: "('a,'b::order) distr_d program" 
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165 
assumes 
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Distrib_spec: "D \<in> distr_spec" 
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167 

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168 

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169 
(**** 
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# {** Network specification ***} 
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171 

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# {*spec (9.1)*} 
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# network_ask :: "'a systemState program set 
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# "network_ask == \<Inter>i \<in> lessThan Nclients. 
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# Increasing (ask o sub i o client) 
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176 
# guarantees[ask] 
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177 
# (ask Fols (ask o sub i o client))" 
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178 

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# {*spec (9.2)*} 
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# network_giv :: "'a systemState program set 
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# "network_giv == \<Inter>i \<in> lessThan Nclients. 
14114  182 
# Increasing giv 
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183 
# guarantees[giv o sub i o client] 
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# ((giv o sub i o client) Fols giv)" 
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185 

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# {*spec (9.3)*} 
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# network_rel :: "'a systemState program set 
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# "network_rel == \<Inter>i \<in> lessThan Nclients. 
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# Increasing (rel o sub i o client) 
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190 
# guarantees[rel] 
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# (rel Fols (rel o sub i o client))" 
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192 

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# {*spec: preserves part*} 
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# network_preserves :: "'a systemState program set 
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195 
# "network_preserves == preserves giv Int 
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# (\<Inter>i \<in> lessThan Nclients. 
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# preserves (funPair rel ask o sub i o client))" 
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198 

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# network_spec :: "'a systemState program set 
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# "network_spec == network_ask Int network_giv Int 
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201 
# network_rel Int network_preserves" 
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202 

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203 

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# {** State mappings **} 
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# sysOfAlloc :: "((nat => merge) * 'a) allocState_d => 'a systemState" 
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# "sysOfAlloc == %s. let (cl,xtr) = allocState_d.dummy s 
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# in ( giv = giv s, 
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# ask = ask s, 
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# rel = rel s, 
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# client = cl, 
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# dummy = xtr)" 
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212 

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213 

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# sysOfClient :: "(nat => merge) * 'a allocState_d => 'a systemState" 
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# "sysOfClient == %(cl,al). ( giv = giv al, 
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# ask = ask al, 
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# rel = rel al, 
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# client = cl, 
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219 
# systemState.dummy = allocState_d.dummy al)" 
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220 
****) 
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221 

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222 

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223 
declare subset_preserves_o [THEN subsetD, intro] 
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224 
declare funPair_o_distrib [simp] 
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declare Always_INT_distrib [simp] 
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226 
declare o_apply [simp del] 
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227 

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228 

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229 
subsection{*Theorems for Merge*} 
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230 

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231 
lemma (in Merge) Merge_Allowed: 
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"Allowed M = (preserves merge.Out) Int (preserves merge.iOut)" 
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233 
apply (cut_tac Merge_spec) 
14114  234 
apply (auto simp add: merge_spec_def merge_allowed_acts_def Allowed_def 
235 
safety_prop_Acts_iff) 

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236 
done 
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237 

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lemma (in Merge) M_ok_iff [iff]: 
14114  239 
"M ok G = (G \<in> preserves merge.Out & G \<in> preserves merge.iOut & 
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240 
M \<in> Allowed G)" 
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241 
by (auto simp add: Merge_Allowed ok_iff_Allowed) 
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242 

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243 

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244 
lemma (in Merge) Merge_Always_Out_eq_iOut: 
14114  245 
"[ G \<in> preserves merge.Out; G \<in> preserves merge.iOut; M \<in> Allowed G ] 
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==> M Join G \<in> Always {s. length (merge.Out s) = length (merge.iOut s)}" 
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247 
apply (cut_tac Merge_spec) 
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apply (force dest: guaranteesD simp add: merge_spec_def merge_eqOut_def) 
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249 
done 
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250 

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251 
lemma (in Merge) Merge_Bounded: 
14114  252 
"[ G \<in> preserves merge.iOut; G \<in> preserves merge.Out; M \<in> Allowed G ] 
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==> M Join G \<in> Always {s. \<forall>elt \<in> set (merge.iOut s). elt < Nclients}" 
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254 
apply (cut_tac Merge_spec) 
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apply (force dest: guaranteesD simp add: merge_spec_def merge_bounded_def) 
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256 
done 
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257 

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258 
lemma (in Merge) Merge_Bag_Follows_lemma: 
14114  259 
"[ G \<in> preserves merge.iOut; G \<in> preserves merge.Out; M \<in> Allowed G ] 
260 
==> M Join G \<in> Always 

261 
{s. (\<Sum>i \<in> lessThan Nclients. bag_of (sublist (merge.Out s) 

262 
{k. k < length (iOut s) & iOut s ! k = i})) = 

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263 
(bag_of o merge.Out) s}" 
14114  264 
apply (rule Always_Compl_Un_eq [THEN iffD1]) 
265 
apply (blast intro: Always_Int_I [OF Merge_Always_Out_eq_iOut Merge_Bounded]) 

266 
apply (rule UNIV_AlwaysI, clarify) 

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apply (subst bag_of_sublist_UN_disjoint [symmetric]) 
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268 
apply (simp) 
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269 
apply blast 
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apply (simp add: set_conv_nth) 
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271 
apply (subgoal_tac 
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"(\<Union>i \<in> lessThan Nclients. {k. k < length (iOut x) & iOut x ! k = i}) = 
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273 
lessThan (length (iOut x))") 
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apply (simp (no_asm_simp) add: o_def) 
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275 
apply blast 
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276 
done 
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277 

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lemma (in Merge) Merge_Bag_Follows: 
14114  279 
"M \<in> (\<Inter>i \<in> lessThan Nclients. Increasing (sub i o merge.In)) 
280 
guarantees 

281 
(bag_of o merge.Out) Fols 

282 
(%s. \<Sum>i \<in> lessThan Nclients. (bag_of o sub i o merge.In) s)" 

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283 
apply (rule Merge_Bag_Follows_lemma [THEN Always_Follows1, THEN guaranteesI], auto) 
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284 
apply (rule Follows_setsum) 
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285 
apply (cut_tac Merge_spec) 
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286 
apply (auto simp add: merge_spec_def merge_follows_def o_def) 
14114  287 
apply (drule guaranteesD) 
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288 
prefer 3 
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289 
apply (best intro: mono_bag_of [THEN mono_Follows_apply, THEN subsetD], auto) 
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290 
done 
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291 

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292 

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293 
subsection{*Theorems for Distributor*} 
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294 

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295 
lemma (in Distrib) Distr_Increasing_Out: 
14114  296 
"D \<in> Increasing distr.In Int Increasing distr.iIn Int 
297 
Always {s. \<forall>elt \<in> set (distr.iIn s). elt < Nclients} 

298 
guarantees 

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299 
(\<Inter>i \<in> lessThan Nclients. Increasing (sub i o distr.Out))" 
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300 
apply (cut_tac Distrib_spec) 
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301 
apply (simp add: distr_spec_def distr_follows_def) 
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302 
apply clarify 
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303 
apply (blast intro: guaranteesI Follows_Increasing1 dest: guaranteesD) 
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304 
done 
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305 

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306 
lemma (in Distrib) Distr_Bag_Follows_lemma: 
14114  307 
"[ G \<in> preserves distr.Out; 
308 
D Join G \<in> Always {s. \<forall>elt \<in> set (distr.iIn s). elt < Nclients} ] 

309 
==> D Join G \<in> Always 

310 
{s. (\<Sum>i \<in> lessThan Nclients. bag_of (sublist (distr.In s) 

311 
{k. k < length (iIn s) & iIn s ! k = i})) = 

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312 
bag_of (sublist (distr.In s) (lessThan (length (iIn s))))}" 
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313 
apply (erule Always_Compl_Un_eq [THEN iffD1]) 
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314 
apply (rule UNIV_AlwaysI, clarify) 
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315 
apply (subst bag_of_sublist_UN_disjoint [symmetric]) 
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316 
apply (simp (no_asm)) 
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317 
apply blast 
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318 
apply (simp add: set_conv_nth) 
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319 
apply (subgoal_tac 
14114  320 
"(\<Union>i \<in> lessThan Nclients. {k. k < length (iIn x) & iIn x ! k = i}) = 
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321 
lessThan (length (iIn x))") 
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322 
apply (simp (no_asm_simp)) 
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323 
apply blast 
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324 
done 
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325 

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326 
lemma (in Distrib) D_ok_iff [iff]: 
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327 
"D ok G = (G \<in> preserves distr.Out & D \<in> Allowed G)" 
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328 
apply (cut_tac Distrib_spec) 
14114  329 
apply (auto simp add: distr_spec_def distr_allowed_acts_def Allowed_def 
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330 
safety_prop_Acts_iff ok_iff_Allowed) 
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331 
done 
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332 

14114  333 
lemma (in Distrib) Distr_Bag_Follows: 
334 
"D \<in> Increasing distr.In Int Increasing distr.iIn Int 

335 
Always {s. \<forall>elt \<in> set (distr.iIn s). elt < Nclients} 

336 
guarantees 

337 
(\<Inter>i \<in> lessThan Nclients. 

338 
(%s. \<Sum>i \<in> lessThan Nclients. (bag_of o sub i o distr.Out) s) 

339 
Fols 

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340 
(%s. bag_of (sublist (distr.In s) (lessThan (length(distr.iIn s))))))" 
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341 
apply (rule guaranteesI, clarify) 
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342 
apply (rule Distr_Bag_Follows_lemma [THEN Always_Follows2], auto) 
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343 
apply (rule Follows_setsum) 
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344 
apply (cut_tac Distrib_spec) 
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345 
apply (auto simp add: distr_spec_def distr_follows_def o_def) 
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346 
apply (drule guaranteesD) 
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347 
prefer 3 
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348 
apply (best intro: mono_bag_of [THEN mono_Follows_apply, THEN subsetD], auto) 
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349 
done 
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350 

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351 

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352 
subsection{*Theorems for Allocator*} 
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353 

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354 
lemma alloc_refinement_lemma: 
14114  355 
"!!f::nat=>nat. (\<Inter>i \<in> lessThan n. {s. f i \<le> g i s}) 
15074  356 
\<subseteq> {s. (SUM x: lessThan n. f x) \<le> (SUM x: lessThan n. g x s)}" 
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357 
apply (induct_tac "n") 
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358 
apply (auto simp add: lessThan_Suc) 
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359 
done 
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360 

14114  361 
lemma alloc_refinement: 
362 
"(\<Inter>i \<in> lessThan Nclients. Increasing (sub i o allocAsk) Int 

363 
Increasing (sub i o allocRel)) 

364 
Int 

365 
Always {s. \<forall>i. i<Nclients > 

366 
(\<forall>elt \<in> set ((sub i o allocAsk) s). elt \<le> NbT)} 

367 
Int 

368 
(\<Inter>i \<in> lessThan Nclients. 

369 
\<Inter>h. {s. h \<le> (sub i o allocGiv)s & h pfixGe (sub i o allocAsk)s} 

370 
LeadsTo {s. tokens h \<le> (tokens o sub i o allocRel)s}) 

371 
\<subseteq> 

372 
(\<Inter>i \<in> lessThan Nclients. Increasing (sub i o allocAsk) Int 

373 
Increasing (sub i o allocRel)) 

374 
Int 

375 
Always {s. \<forall>i. i<Nclients > 

376 
(\<forall>elt \<in> set ((sub i o allocAsk) s). elt \<le> NbT)} 

377 
Int 

378 
(\<Inter>hf. (\<Inter>i \<in> lessThan Nclients. 

379 
{s. hf i \<le> (sub i o allocGiv)s & hf i pfixGe (sub i o allocAsk)s}) 

380 
LeadsTo {s. (\<Sum>i \<in> lessThan Nclients. tokens (hf i)) \<le> 

381 
(\<Sum>i \<in> lessThan Nclients. (tokens o sub i o allocRel)s)})" 

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382 
apply (auto simp add: ball_conj_distrib) 
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383 
apply (rename_tac F hf) 
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384 
apply (rule LeadsTo_weaken_R [OF Finite_stable_completion alloc_refinement_lemma], blast, blast) 
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385 
apply (subgoal_tac "F \<in> Increasing (tokens o (sub i o allocRel))") 
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386 
apply (simp add: Increasing_def o_assoc) 
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387 
apply (blast intro: mono_tokens [THEN mono_Increasing_o, THEN subsetD]) 
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388 
done 
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389 

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390 
end 